聚合硫酸铁碱化度国标测定法的一点改进

针对聚合硫酸铁碱化度的国标测定方法提出了一点改进，扩大了碱化度的测定范围，使其适合于某些碱化度较高或铁含量较高的聚铁样品的测定。改进之处在于先加入较多量的盐酸分解试样，用氟化钾掩蔽Ｆｅ３＋后，再加入定量的ＮａＯＨ溶液中和部分多余的酸，最后用较稀（０１ｍｏｌ／Ｌ）的ＮａＯＨ溶液滴定至终点。

A MODIFICATION OF THE NATIONAL STANDARD MEASUREMENT FOR ALKALIZATION OF POLYMERIC IRON SULFATE

A modification is proposed for the national standard measuring method of the alkalization of polymeric iron sulfate and the measuring range of the alkalization is enlarged,which can be suitable for determining the samples of polymeric iron sulfate with higher alkalization or iron content.The modification is such that a more content of hydrochloric acid is used first to decompose a sample and after Fe3+ is shielded by potassium fluoride,a certain amount of NaOH solution is added to neutralize a part of the excessive acid,and finally a thinner solution of NaOH(01mol/L) is used for titrating to the end.